The light - duty vehicle fleet is expected to undergo substantial technological changes over the next several decades. (nas-sites.org)
That, in turn, could make it next to impossible to achieve the needed dramatic global reductions in CO2 emissions over the next several decades. (thinkprogress.org)
The conventional wisdom is that world coal production will continue to grow over the next several decades. (rstb.royalsocietypublishing.org)